2 Packs Plug In Gas Carbon Monoxide Detectors, 4-In-1 Natural Gas Leak, Rv Product Features ?4-in-1 Combination Gas and Carbon Monoxide Detector?Newly upgraded and optimized, high definition digital large round screen, plug and play, capable of detecting and displaying temperature, humidity, natural gas and carbon monoxide gas levels in real time. ?4-in-1 Upgraded Sensor?Highly Reliable, Sensitive and Accurate Sensor ?Burst Flash Design Alarm?When combustible gas or carbon monoxide gas reaches the default value, the device immediately emits a burst light, as well as displaying the gas concentration, and 85dB alarm. ?4-in-1 Real-time Display?Carbon monoxide level(PPM), combustible gas level(%LEL), temperature(F) and humidity(RH%) ?Applications?4-in-1 gas carbon monoxide detector is suitable for home, kitchen, apartment and etc. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!